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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09d948f0a52c16915e3197b101cfb9c92f574877a1703f1c55f60097e4f5286' 
  AND token = 'kieZL349gJ5Vdwuy57P1dEgvbJNqIkUz7NM8QKRPnZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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