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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa0e6eae89894e92470efa43569740b0b967b7803de523e264e65f7ae60d809' 
  AND token = '5+jEOdDP5gS1pI1/XXGZUg0Y3IKZ2KxPkdLH3kip/8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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