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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6034b1e955eafe1783e2ad8172733bb01decd3727b2b266e1a8f6402175e682e' 
  AND token = 'vI8Vfv4dCRg6X/m/NzU7UOtrIrnW5ermnWtDiElXTPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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