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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7a454310566e0bbb8b2df63921b0722d198d033616510e5e10516ff8a99267' 
  AND token = 'k/GNm5WQGfdWDn+e8bf7YRvDmjDlY+/BYR+1SHulnO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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