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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed90588b7b065507cee8a576d25dec056c55b924ff60d291dc00f5e9b53632d8' 
  AND token = 'f3wRcdAfv9hZ2ko80KsorH/MLUq/uEiAH7L3aEkftVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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