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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968dec6773d81d464fe12eda5d87705451ae26cf014889d3c8cd2c3f1c560d2e' 
  AND token = 'AZF1TC1TXBEGMsheVHzVrH8WogckWz7dKY+bIsem8Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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