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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cc7964e63faacf15df2c84a6d6c8e7e2a1ff5116674c37b0ff3eddccc232a3' 
  AND token = 'cts28VQvgVjCGP/ek28hoqK/85KG8PEzlby1iiKFrK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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