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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95a4ddc7a4188591e6946ebaccce4976ae31751896f9b71b3578788f8f5fa17' 
  AND token = '7oHH/uj6L8oqIkvKmQVAipylR+XJRvbhyDErbUit9hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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