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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85591da69576614c745c80c7728fe0600fe9430be5379f55adf6925c0e7028be' 
  AND token = 'aKRclhdChyDxHT/0jmriEukVEsZjTAT+/dMIrbCIdY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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