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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fb5ce1b86af95ee8c1c64d87676af11bc413c3956ed1a141fd6dc50a9f5bc0' 
  AND token = '1bHJSKsBfFVcA3CQc+4Z3UxpyPFnovWNxd6TOZQf8oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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