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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a14d936acdaac24c810348d35cc37cddc19f4da11a2d9d6b173680ee52a3dd' 
  AND token = 'ggW0SPXo+M2YWHbmqnrs692o4M2IBp5OjoZeOF2pX6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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