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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db0f51dbb92421dd4cb5bb58caa4004bf2803265d39a2c5338880fa6343fc31' 
  AND token = 'W5gyCxngROeswuTxil4KQXX+Bp01Os0fG9irMcdUlGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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