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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9191a616082a27d2a22e97b69f7a2764b6df92ebaefb835d0711c74731c25a' 
  AND token = 'uiqewety6YN0bHsR6neo1ukPIo0AuOB/SMtPy1NCF68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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