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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c0b390aebe2e0c8ff8a7d1d3aef5e1880a5ed41b4ae0d3c0f42c10ad5c62bd' 
  AND token = '8Hoodl7RwwD2rV+BrgBIl3X3UsXB4WrRYRVECsVZiK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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