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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab6f8d6ffe3d49e9725bb7b78c3e24a867479e2ae95e1728a158dc4af981148' 
  AND token = '0o0YbP9RP6au2aOtWwB73PqlkPWiWBH19fiDyn8deGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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