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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aba2d88dfce1dbb76d3dd18090f774e3ab521e9242d18930e3e0d19581e673e' 
  AND token = 'XrMR3FHIknNKbUpDeGf11LCh2XMEy/gl9TxIo8x52GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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