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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d31ae2c441c84b35f939c53954ba99560810f2d2b55048d91fb9aa56855d84' 
  AND token = 'LU6fQAoO9JGe7J99MT+jQE+E3jymXrn3rzW3dVEMRWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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