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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90984bcca953989ce8619175493a49c2e7ae4177c7248889e954629ef38143b9' 
  AND token = 'TV5vLqJ7L64BOdPSTYCujp6uW+GaKGfWYZ9njMDE6v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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