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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a2ae7ff56a0a79a8bf8dcdc26502db5da40eeec672ae921463ad220d7463b9' 
  AND token = 'FpvEM4u8N6aWm5Y1/1pKQm3zWbVi5+rgnCJ3v3jGDLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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