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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f09d6ec1fedb1a6e320e507fb8046f23718d9783ce4d3b89a3ebe7e66e06e98' 
  AND token = 'P/z3eDKwqcoSI+UrTwnbMxvalOwZF65UQEXNr0/1c/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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