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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd295aef0fe198b7e7d89fa8745038a29aae9006438acbe06c89eac72f96a73' 
  AND token = 'MVIG2oTrg/3EoCuAPAqfP4pb0E0/lnsZhLRWlQ/fHuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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