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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf2302cc0148d49fc15bfc1e535e996b734b79292a01660525fe3056df6b8fa' 
  AND token = 'z0602KLmdi0U+bYpmPw54d02o220Uuw60G2wih1gT40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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