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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b4e09a54b39cf6b9106fb69d157880d26a1682818500385801c4b71d7c04eb' 
  AND token = '6jtlrR8M/bS9ln5aCv7tu04F+RMO5Ro39XFGbH0OLLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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