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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307ae65feada104c2eae74c1734bef3098e3b446e7d277a0b5cead0a4942b26c' 
  AND token = 'Rk/KxVc4G2MDHki+OcgJo/pr3jl6nmv695O9apT6RyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}