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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726e3b698e45899a156c86e44255761efcc4f5a052243193dc0498497ff96e2e' 
  AND token = 'g0/dF4TbaPdweHHePXtw4YBHjWlKmXHWOWunNu/7C5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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