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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbaa025dba6e058f9cf312442c26b59dd2e09f1e5e7ffa73135f9945090e3f4' 
  AND token = 'mqlZujrFTfh4oxzJK7N6N86Tm9iLyHF0smhCqDB3kQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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