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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca343ca32d8a8784f4ca9764cdc9d6138fb8312a87e4dfcd25e19e0db8a9f79' 
  AND token = '+T1lCRkn612efsaLytv2aH5QOyaO/5Tu65wUqnNZvJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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