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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811bd7810c89820cffe8c56be2ef74af0bb5319490c4e08e149e9b65ca87d887' 
  AND token = 'CfhtWfetim+mC27GqZot5Glawg+n1lNGyqwfOQqkJBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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