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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f4ecf09b8b7b7889217a097423542593b14da4f327830002615c528cd8b5cf' 
  AND token = 'EhmF7evFiF9u35bZ1SNE5dB7qRyM26g//SEgQlOnL58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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