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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6089db2f27d1bdd44ef05724f9df6e2a248e5f1d86d0a5fe068c3de1e769e77e' 
  AND token = 'u+9NX1kXKuWIlZQYeI90StiRrMPixvl9FUoBiqZjsMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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