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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf980e8f0fa58b08df806cceec9418f30ca973a300189696fd34fe0bebca518' 
  AND token = 'Lqc1yC0B1uQOlwYm8FDr9XLnJ+4Qm34n55/2c2gHf3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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