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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf2b656a5f15145fce0e629c557302efb8b50f2730256cd863762e067047495' 
  AND token = '5aOY6msqkqnZ8H6hgBW63L0DexCq8xJ57kLFXfUWCEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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