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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3ee615a3ef5d304f64e7de9b0002c3a55b098bb9027e24aea9bc33780c14f8' 
  AND token = '1X2CH2W0reUTlw9/sD7LtElaIWPC06BQBBXCsZ/G7dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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