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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a3313f8d455bc7a577f0e76ce60c73ded504da3c2d7aabcbc90306cb039456' 
  AND token = '0j/7XIAmv4t9peYYD0BFvcjAahb9KiJIkBwMcQPcca4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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