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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79564ef5938d8bdfa8aa4e170f0acb041affaa63223e395a983d99d3b5b43029' 
  AND token = 'qcxZFy69DbfW/Yfy535uYBAtSB4kK4rdvXbEIUZcWnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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