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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd20b4d037781de293a5879568bca06ffa891b83300bc5114e2e8f33bfd76725' 
  AND token = 'TagnA5Hrp06uyIe+rRRPQNKILUMOPhPuTnaK17B6dEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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