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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a3c6f3362441ffdcca9a6661276f2ee4682856dc90250deb5b7481b326e7d3' 
  AND token = 'BXArkrn1r/D5beClDxyH6aG8+/gLtD7xuAwJz0/pnX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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