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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a839f4379ce7684a54646f76ec0d1d34e80f2c449bb61953c5c529c53cd89c' 
  AND token = 'rkRte0Vnuxao1sXg+F85BnlQCkBQQLqg8jP9JUVCTa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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