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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68c6dd69f24477e78d56190c0c29e92265630f3f857f1aac6ea268bf3fcfc79' 
  AND token = 'BhtfRHkMpScBUZJVhbPcT3kU77lBk6lDnaPRr2BCvxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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