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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4f1bbcaf8579c8a2c5646e71c640e5d0d630884bca985bf0909eb6f7b3e218' 
  AND token = 'cWHREvBsYaPjMXG4F+4lwIU6Bx0cZIHgvKjjY0pcraY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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