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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575396b5ebb87be59ccc9c29409c8c8f2e81a260c52f685788c14d83c9fb882d' 
  AND token = 'tkwhPYmQJWH71oQWNBR/2hhOyx877wiB2NJR8GsOf4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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