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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa23bbc036d13813b0c6e3e412c10c9be3782cbe07aa53ce677ff53b1531c99' 
  AND token = 'f8Nz9aXxAP5vmBoV8yD19wHQbq7hYEXM32GB1D0fDSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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