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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a47cc09a6506b822259a600cbf034f025e6d74a1364fcbe554000c3b59f224' 
  AND token = 'Iu0zzTUf+TYwV2qq6zsiLhau3gfPHb37EcEQ7NvIGH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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