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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf60923c25f00233fd1ad4df407bdf610dfb5429417ffa2c482306e96ea2402' 
  AND token = 't8ZIs6aXaBT25VUjyTR91wFp3A8QhlS/da4L2RRSD5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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