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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e24fbf2648268cd77997a11e0ec0fb7f1526b8a5d5f04f14e5791a0e45a25b1' 
  AND token = 'UnuDtw1FOAGItdvxkgJ3wNpwujvZcgEbNzrJ2T6QOOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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