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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abc1f123ba96e37768cccaca2d3eff730b8942caa311b0a9e7b20dd4943c3ba' 
  AND token = '59KhYol4zBKvqXwF2r+1rIdbo9LjW8rWV88qrGl+PkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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