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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c23fe47279b5fa48c9e8501ff7e46cdb44e47f26e7c0ab37ae69f50ac4f452' 
  AND token = 'haE5OFmh0hb1oqbGEcq7QH5LXloSHHuQlgh39J2D2BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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