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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a70bb15939d02373ad1866e0cb35341dd1426a66ee12ac32a0c8c38a0cd8e1' 
  AND token = 'eIdGBoHjbHY3fi6KotxGDsnS+GSaKhoXOrCI6UDC3DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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