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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ea34228e9a86f15c385876ea1c5caace3cbf18f479047f2a0ec98c54aeadf3' 
  AND token = 'q/Q2UQ5nXqeBrmwJ+5ptsRzNENoIeM9ASLLz5K+7JnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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