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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586e44ebd410d39370c68d1321a17cd5e20b5e57ebb84d050846277dc919eb51' 
  AND token = 'ZtmEKZnfxzy8WZKuXptQKEj9VSAg4pFHxQ5o50o+FPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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