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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664065cf8ccec92fafe7b598dcca7d7dfcb97246382aa2db6f6639086030028d' 
  AND token = 'CUrA5G3bohyH2SskYect34rnyF8RPey3EsRsz1qhPjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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