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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bae8481c6588327bcc737b87466f7b4e7e73e9615fc7a01b5e4c82c964f3cc' 
  AND token = '44VB4fBVU70MZbGLKtur54XL2Oz+0xBCDJEHw5iBq1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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