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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd991689d656c6d4f38680d59d77667a45b6df72761f7d25b6e0b9d0e9d8c2c6d' 
  AND token = 'Nzwm4dpineevT8Fk0Ikwi9YPHMcLPIIG+MTOwKgbbv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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