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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19f81a0ebecf1e5e51b0096fc4a8aa350dde1bc17c0adae97ac16f4fd2dd6a9' 
  AND token = 'oQPABDVFdWBboVBo1mAugT9HTAA8xdM6ihCirdDBNzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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