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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8ac404e6de7b3b9597b86738a83204486f3eca320074538d1157d3dce4322c' 
  AND token = 'DkU7qUx3afIjziIIvnDAsX5mUk79zHoM008rrfgPeEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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