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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c1f23a02079e78b19248d6f7aecd575af49a0988646203339ec2bfe1c836d6' 
  AND token = 'NFxm5sA+7FSvintOB1g88r/gBSK8sz2lPd4TItBkFCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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